Managing EBOMs-MBOMs > Managing part BOMs

What is a part BOM and why use it?

A part bill of materials (BOM) takes its structure from a CAD model in a released state, such as NX or CATIA. The part BOM can be a collection of design or part items but is essentially a physical model that improves on the Teamcenter EBOM/MBOM relationship. Once the part BOM is created, it can be used to create a manufacturing BOM (MBOM), similarly to an EBOM.

In many cases, a Teamcenter part requires a connection to a CAD design so that the part BOM can be kept up-to-date with the CAD model. A part BOM delivers a lifecycle separation of CAD design and Teamcenter part life cycles to better support downstream applications like Process Simulate, Teamcenter Manufacturing, SIMATIC, Manufacturing Execution System Integration (MES), and Electronic Work Instructions. Although a part BOM is based on the traditional EBOM/MBOM paradigm, it is intended to offer a more controlled and predictable separation between the design BOM and part BOM in Manufacturing Process Planner.

The part BOM is intended for a design engineer, the owner of the part or subassembly. The design engineer is responsible for all aspects of the part/subassembly definition, including ensuring that a new part is actually required and that a suitable part does not already exist in the part catalog, coordinating with the Enterprise Resource Planning (ERP) system to define the part number and material master, and authorizing CAD design work if 3D definition is needed. To create the part BOM, the design engineer would typically:

Receive a design BOM structure converted from a CAM/CAD application that consists of design elements.
Create a preliminary part or subassembly BOM with parent and child parts that match the design BOM structure in the context of the manufacturing process, and link the preliminary to the design BOM.
Perform alignments between the design BOM and preliminary BOM to create the part BOM.

Note A system administrator can also create a part BOM from a design BOM using the me_create_mbom utility.

Use a workflow handler to propagate design revisions as part of your existing design review and approval to update:

Alignments and their relationships.

Part BOM line properties.

All BOMs and BOPs to which part BOM lines are assigned or consumed.

Regularly run an advanced accountability check between the design BOM and part BOM to ensure BOM lines match, and update or remove BOM lines as changes require.